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Last name Didan (Didan , Дидан ) , in the entire world, is quite a rare cognomen. The cognomen Didan is characteristic of Northern Africa, particularly Algeria, where it is quite a rare surname, Sudan, where it is a rare surname, and Morocco. Not in comparison with a country's population, it is the most numerous in Algeria, Indonesia, and Sudan. More frequently, Didan is the forename as well as the last name.